knien
to kneel
To lower oneself onto one or both knees so that the body rests on the knees.
Er kniete vor ihr nieder, um ihr den Heiratsantrag zu machen.
He knelt down in front of her to propose to her.

to kneel
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to kneel
To lower oneself onto one or both knees so that the body rests on the knees.
Er kniete vor ihr nieder, um ihr den Heiratsantrag zu machen.
He knelt down in front of her to propose to her.

The verb 'knien' (to kneel) is derived directly from the noun 'das Knie' (the knee). It describes the action one performs with the knees.
Das Kind kniete auf dem Boden, um mit seinen Spielzeugautos zu spielen.
The child knelt on the floor to play with his toy cars.
The perfect tense of 'knien' (to kneel) is formed in standard German with the auxiliary verb 'haben' (to have), because it describes a position.
Er hat eine Stunde lang vor dem Altar gekniet.
He knelt in front of the altar for an hour.
In its literal meaning, 'knien' (to kneel) is often used with the prepositions 'vor' (+ dative) or 'auf' (+ dative).
Der Gärtner kniet auf der Erde, um Unkraut zu jäten.
The gardener is kneeling on the ground to weed.
The expression 'sich in etwas knien' (to throw oneself into something) is reflexive and requires the preposition 'in' with the accusative. It means to devote oneself to something with full energy.
Ich muss mich jetzt richtig in dieses Projekt knien, um die Frist einzuhalten.
I really have to throw myself into this project now in order to meet the deadline.
The figurative meaning 'sich in etwas knien' (to throw oneself into something) belongs to colloquial language and sounds very committed and energetic.
Wenn du die Prüfung bestehen willst, musst du dich in den Lernstoff knien.
If you want to pass the exam, you have to throw yourself into the study material.
to squat / sit
'knien' and 'hocken' both describe a low body position with bent legs. With 'knien', one knee or both knees touch the ground, and the body rests on the knees. With 'hocken', the knees are strongly bent, but you are more like sitting low on your feet or close to the ground. The knees do not have to touch the ground. The words can be confused because the positions look similar. In addition, 'hocken' can also colloquially simply mean 'to sit', often for a longer time. If the knees are on the ground, you say 'knien'; if someone is deep in a squat, you say 'hocken'.

Beim Putzen kniet Paul vor dem Sofa, um die Münze zu suchen.
While cleaning, Paul kneels in front of the sofa to look for the coin.
Jana hockt im Garten neben der Pflanze und schaut sich die Blätter an.
Jana is squatting in the garden next to the plant and looking at the leaves.